Dear La Roze,

Please learn, how to use browser Inspector. It's easy and necessary for frontend developers to use this tool.

With it, you're able to check an item's style for example. And if you'll use the Inspector, you'll see, that .md-outline label has the .md-form.md-outline label rule, to which you have to add color style.

Here's the ready-to-use code:

.md-form.md-outline label {
  color: red;
}

Best Regards,

Damian